U.S. Military Keys
During WW1 & WW2, many different keys were made for the U.S. Navy and Army Signal Corps. Navy keys can be identified by a prefix that begins with the letter "C". For example, CAG was General Radio, CJB was JH Bunnell, CTE was Telephonics Corp, etc.
Army Signal Corps Keys were known as "J-Series" keys because they identified their keys by a J-number ranging from J-2 through J-51 (although not every J-number actually exists)
Below are pictures of many of the Navy and Signal Corps keys.
(Click the thumbnails below to view a larger picture):
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